I would suggest the answer is, yes. This photo snagged from post #8 suggests to me that there is a relationship between the arm as it is clamped to the shaft and the timing hole that is drilled in the shaft. I don't think there is a relationship to a collapsing magnetic field and the points opening as there is in a traditional mag, this is conjecture on my part. I suspect if you were to open up a brand new functioning BTH and line up the arrow on the end of the shaft and place the 6mm rod in the timing hole that arm will be just approaching the one of the coils.
If you think about Lucas Rita systems, you set the nub on the reluctor back 5mm from the pick up coil and on and Boyer Bransden systems the is a little window to view a red dot as the magnet on the disk approaches the coil and you can choose whether the system is spinning clock or counter clock wise. The system needs time to react that is why I think everything is timed at where you want full advance to occur.
I'm wondering if part of Carl's issue is due to heat and/or vibration if the arms has moved a little or the clamping screw has worked loose.
Just grasping at straws.
If you think about Lucas Rita systems, you set the nub on the reluctor back 5mm from the pick up coil and on and Boyer Bransden systems the is a little window to view a red dot as the magnet on the disk approaches the coil and you can choose whether the system is spinning clock or counter clock wise. The system needs time to react that is why I think everything is timed at where you want full advance to occur.
I'm wondering if part of Carl's issue is due to heat and/or vibration if the arms has moved a little or the clamping screw has worked loose.
Just grasping at straws.